Feel a draft near your windows when the cold hits? Before you crank the thermostat up and watch your energy bill climb, try this: grab a $5 tube of silicone caulk and seal those gaps yourself. It's one of the easiest and most cost-effective home improvements you can make, and it takes less than an hour for the whole house. Start by running your hand around the edges of each window frame, inside and out. If you feel air movement or see visible gaps between the frame and the wall, that's where your heated air is escaping. Old caulk that's cracked, peeling, or pulling away needs to be scraped out first — a flathead screwdriver or a cheap five-in-one painter's tool works great for that. Cut the tip of your caulk tube at a 45-degree angle, keep the bead thin and steady, and smooth it with a wet finger or a damp rag. That's really the whole process. Don't worry about making it look perfect on your first try — even a messy bead of caulk blocks more air than an open gap. For Columbus homeowners, this is especially worth doing before November. Our winters are no joke, and the Department of Energy estimates that air leaks around windows and doors can account for 25 to 30 percent of your heating costs. A few dollars in caulk can realistically save you $50 to $100 over a single season. If you find gaps wider than a quarter inch, caulk alone won't cut it — that's where backer rod or weatherstripping comes in, and we're always happy to help if you're not sure what a particular situation calls for. — The iSpec LLC Team